A test process and method for AGM separator for valve-regulated lead-acid battery

Abstract

The present invention discloses a test process and method for an AGM separator used in a valve-regulated lead-acid battery, relating to the technical field of production and detection of AGM separators. The present invention reflects the density of the separator by measuring the weight and volume of the separator, and confirms whether the separator belongs to the same type of separator through density comparison; at the same time, the present invention can obtain the porosity inside the separator, as well as the theoretical acid absorption value and the actual acid absorption value through soaking in water and acid, and corresponding mass and volume detection calculations, and judges the performance of the separator by comparing the theoretical acid absorption value and the actual acid absorption value; at the same time, the separator specimen is vertically placed into the first acid tank containing acid solution, so that the bottom of the group of separator specimens contacts the acid solution, and then the timing starts. After the timing ends, the maximum wetting height from the bottom of the group of separator specimens to the acid solution at this time is detected as the acid climbing height; and according to the acid absorption volume V B3 , the acid solution density ρ2 and the separator specimen m B2 , the acid absorption amount of the separator specimen is calculated as (ρ2×V B3 ) / m B .

Description

Technical Field

[0001] The invention belongs to the technical field of AGM separator production and detection, and in particular relates to a testing process and method for an AGM separator for a valve-regulated lead-acid battery. Background Art

[0002] As another very important component of lead-acid batteries in addition to the positive plate and negative plate, the separator has a great impact on the performance of lead-acid batteries, especially valve-regulated lead-acid batteries (VRLA), so it is also called the "third electrode" of VRLA batteries. Since AGM separators were used in sealed lead-acid batteries around 1970 and achieved good application results, they have been widely used in lead-acid batteries and play a very important role in VRLA batteries: 1) Isolate the positive and negative plates to prevent internal short circuits in the battery; 2) Store electrolyte and provide electrolyte for electrode reactions; 3) Provide channels for oxygen circulation in the battery and the migration of ions and water; 4) Ensure the internal assembly pressure of the battery and inhibit the expansion and shedding of active substances.

[0003] Domestic and foreign researchers have carried out a lot of research work on the performance testing of AGM separators for VRLA batteries, involving various aspects of the AGM separators' physical structure, mechanical properties, liquid absorption properties, gas diffusion properties, etc., providing detailed data for separator research and development.

[0004] In the existing partition inspection process, sampling inspection is usually carried out. If partitions of different types are mixed together, it is inconvenient to distinguish and test them because of their similar appearance and size. Summary of the invention

[0005] The purpose of the present invention is to provide a testing process and method for AGM separators for valve-regulated lead-acid batteries, which reflects the density of the separators by measuring the weight and volume of the separators, and confirms whether the separators belong to the same category by density comparison, thereby solving the problem that when separators of different categories are mixed together, it is inconvenient to distinguish and test them due to their similar appearance and size.

[0006] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is a testing process and method for an AGM separator for a valve-regulated lead-acid battery, comprising the following steps:

[0008] Step 1: Take the AGM separator samples and divide them into two groups, marked as A and B respectively;

[0009] Step 2: Take the A group of partition samples, weigh them and mark them as m A1 , and at the same time measure the length L of the partition sample of group A A1 、Width S A1and height H A1 , then the theoretical volume of the A group of partition samples is V A0 =L A1× S A1× H A1 Place the A group of partition samples in the first water tank and let it stand for 1 hour. Record the height of the liquid level at this time to obtain the drainage volume V at this time. A1 , and thus the actual density of the AGM separator sample can be calculated

[0010] Step 3: Take out the immersed A group of partition samples, quickly place them in the second water tank, and record the height of the liquid level at this time to obtain the drainage volume V at this time. A2 , then the water absorption volume of the partition sample of group A is V0=V A2 -V A1 , at this time, the water absorption volume V0 is the internal pore volume of the separator sample of group A;

[0011] Step 4: Displacement Volume V A1 That is the actual volume of the A group of partition samples, then V A0 =K×V A1 ;

[0012] Step 5: Take the B group of partition samples, weigh them and mark them as m B1 , and measure the length L of the B group of partition samples at the same time B1 、Width S B1 and height H B1 , then the theoretical volume of the B group of partition samples is V B0 =L B1× S B1× H B1 ;

[0013] The actual volume of the partition sample of group B is

[0014] Step 6, vertically placing the B group partition sample in the first acid tank containing the acid solution, so that the bottom of the B group partition sample contacts the acid solution, and then starting timing. After the timing ends, the maximum infiltration height from the bottom of the B group partition sample to the acid solution is detected as the acid climbing height;

[0015] Step 7: completely immerse the baffle sample of group B into the acid solution of the first acid tank, let it stand for 1 hour, take it out and quickly place it into the second acid tank containing the acid solution, measure the height increase of the acid solution level in the second acid tank, and calculate the volume V of the baffle after acid absorption. B2 ;

[0016] Step 8: Calculate the actual acid absorption volume V of the B group separator sample at this time B3 =V B2 -V B1; Simultaneously calculate the internal pore volume V of the B group of separator samples B4 =V B0 -V B1 ; Compare V B3 and V B4 The actual acid absorption status of the partition samples in group B can be known at this time.

[0017] Furthermore, in step 5, V B1 '=V A0 / V B0 , compare V B1 ' and V B1 The relationship between the two is used to determine whether the compositions of the partition samples in group A and group B are the same.

[0018] Furthermore, in the step 1, it also includes taking an AGM partition sample marked as C, and testing the structural strength of the group A partition samples after being soaked in water, the group B partition samples after being soaked in acid, and the group C partition samples.

[0019] Furthermore, in step 1, it also includes taking an AGM separator sample and marking it as D,

[0020] Drain or dry the group A partition samples after soaking in water and the group B partition samples after soaking in acid;

[0021] After drying, the partition samples of group A, group B and group D were placed at a height of 1m for free fall, and the lead paste falling amounts M1, M2 and M3 of the partition samples of group A, group B and group D were measured respectively.

[0022] Further, take the D group of partition samples, weigh them and mark them as m D1 ;

[0023] The lead paste drop rates of the A group partition samples after immersion in water, the B group partition samples after acid immersion, and the D group partition samples are calculated as follows:

[0024] T A =M1 / m A1 、T B =M2 / m B1 、T D =M3 / m D1 ;

[0025] Compare T A、 T B and T D Determine the effect of water immersion and acid immersion on the lead paste drop rate.

[0026] The acid solution in the first acid tank contains methyl red solution; the concentration of the methyl red solution is 1.28 g / cm 3, the mass fraction of methyl red solution in the acid solution is 1.5%.

[0027] Furthermore, in step 6 and step 7, the temperature of the acid solution is controlled at 35-38°C; and in step 1, the water temperature is controlled at 35-38°C.

[0028] Further, according to the acid absorption volume V B3 , acid density ρ2 and mass m of group B separator sample B2 The acid absorption of the B group separator sample is calculated as (ρ2×V B3 ) / m B2 .

[0029] The present invention has the following beneficial effects:

[0030] The present invention reflects the density of the partition by measuring the weight and volume of the partition, and confirms whether the partition belongs to the same category by density comparison; at the same time, the present invention can obtain the porosity inside the partition and the theoretical acid absorption value and the actual acid absorption value through water immersion and acid immersion, as well as corresponding mass and volume detection calculations, and judge the performance of the partition by comparing the theoretical acid absorption value and the actual acid absorption value.

[0031] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0033] Figure 1 The figure is a flow chart of the testing process and method of the present invention. DETAILED DESCRIPTION

[0034] like Figure 1 The test process and method shown include the following steps:

[0035] Step 1: Take AGM separator samples and divide them into four groups, marked as A, B, C and D respectively;

[0036] Step 2: Take the A group of partition samples, weigh them and mark them as m A1 , and at the same time measure the length L of the partition sample of group A A1 、Width S A1 and height H A1 , then the theoretical volume of the A group of partition samples is V A0 =L A1× S A1×H A1 Place the A group of partition samples in the first water tank and let it stand for 1 hour. Record the height of the liquid level at this time to obtain the drainage volume V at this time. A1 , and thus the actual density of the AGM separator sample can be calculated

[0037] Step 3: Take out the immersed A group of partition samples, quickly place them in the second water tank, and record the height of the liquid level at this time to obtain the drainage volume V at this time. A2 , then the water absorption volume of the partition sample of group A is V0=V A2 -V A1 , at this time, the water absorption volume V0 is the internal pore volume of the separator sample of group A;

[0038] Take the AGM separator sample and mark it as C, and test the structural strength of the A group separator sample after soaking in water, the B group separator sample after soaking in acid, and the C group separator sample;

[0039] Step 4: Displacement Volume V A1 That is the actual volume of the A group of partition samples, then V A0 =K×V A1 ;

[0040] Step 5: Take the B group of partition samples, weigh them and mark them as m B1 , and measure the length L of the B group of partition samples at the same time B1 、Width S B1 and height H B1 , then the theoretical volume of the B group of partition samples is V B0 =L B1× S B1× H B1 ;

[0041] The actual volume of the partition sample of group B is

[0042] At the same time, calculate V B1 '=V A0 / V B0 , compare V B1 ' and V B1 The relationship is used to determine whether the composition of group A partition samples and group B partition samples is the same; thereby determining whether group A partition samples and group B partition samples belong to the same category of partitions.

[0043] Step 6, vertically placing the B group partition sample in the first acid tank containing the acid solution, so that the bottom of the B group partition sample contacts the acid solution, and then starting timing. After the timing ends, the maximum infiltration height from the bottom of the B group partition sample to the acid solution is detected as the acid climbing height;

[0044] Step 7: completely immerse the baffle sample of group B into the acid solution of the first acid tank, let it stand for 1 hour, take it out and quickly place it into the second acid tank containing the acid solution, measure the height increase of the acid solution level in the second acid tank, and calculate the volume V of the baffle after acid absorption. B2 ;

[0045] Drain or dry the group A partition samples after soaking in water and the group B partition samples after soaking in acid;

[0046] After drying, the partition samples of group A, group B and group D were placed at a height of 1m for free fall, and the lead paste falling amounts M1, M2 and M3 of the partition samples of group A, group B and group D were measured respectively.

[0047] Take the D group of partition samples, weigh them and mark them as m D1 ; Calculate the lead paste drop rate of group A partition samples after immersion, group B partition samples after acid immersion, and group D partition samples respectively: T A =M1 / m A1 、T B =M2 / m B1 、T D =M3 / m D1 ; Compare T A、 T B and T D Determine the effect of water immersion and acid immersion on the lead paste drop rate;

[0048] Step 8: Calculate the actual acid absorption volume V of the B group separator sample at this time B3 =V B2 -V B1 ; Simultaneously calculate the internal pore volume V of the B group of separator samples B4 =V B0 -V B1 ; Compare V B3 and V B4 The actual acid absorption status of the partition samples in group B can be known at this time.

[0049] The acid in the first acid tank contains methyl red solution; the concentration of methyl red solution is 1.28 g / cm 3 , the mass fraction of methyl red solution in the acid solution is 1.5%.

[0050] In step 6 and step 7, the temperature of the acid solution is controlled at 35-38°C; in step 1, the water temperature is controlled at 35-38°C.

[0051] According to the acid absorption volume V B3 , acid density ρ2 and mass m of group B separator sample B2 The acid absorption of the B group separator sample is calculated as (ρ2×V B3 ) / m B2 .

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A testing process and method for AGM separator for valve-regulated lead-acid battery, characterized in that: The steps include: Step 1: Take the AGM separator samples and divide them into two groups, marked as A and B respectively; Step 2: Take the A group of partition samples and weigh them first, marking them as m A1 , and at the same time measure the length L of the partition sample of group A A1 , Width S A1 and height H A1 , then the theoretical volume of the partition sample of group A is V A0 =L A1× S A1× H A1 Place the A group of partition samples in the first water tank and let it stand for 1 hour. Record the height of the liquid level at this time to obtain the drainage volume V at this time. A1 , and thus the actual density of the AGM separator sample can be calculated Step 3: Take out the immersed A group of partition samples, quickly place them in the second water tank, and record the height of the liquid level at this time to obtain the drainage volume V at this time. A2 , then the water absorption volume of the partition sample of group A is V0=V A2 -V A1 , at this time, the water absorption volume V0 is the internal pore volume of the separator sample of group A; Step 4: Displacement Volume V A1 That is, the actual volume of the partition sample of group A, then V A0 =K×V A1 ; Step 5: Take the B group of partition samples, weigh them and mark them as m B1 , and measure the length L of the B group of partition samples at the same time B1 , Width S B1 and height H B1 , then the theoretical volume of the B group of partition samples is V B0 =L B1× S B1× H B1 ; The actual volume of the partition sample of group B is Step 6, vertically placing the B group partition sample in the first acid tank containing the acid solution, so that the bottom of the B group partition sample contacts the acid solution, and then starting timing. After the timing ends, the maximum infiltration height from the bottom of the B group partition sample to the acid solution is detected as the acid climbing height; Step 7: completely immerse the baffle sample of group B into the acid solution of the first acid tank, let it stand for 1 hour, take it out and quickly place it into the second acid tank containing the acid solution, measure the height increase of the acid solution level in the second acid tank, and calculate the volume V of the baffle after acid absorption. B2 ; Step 8: Calculate the actual acid absorption volume V of the B group separator sample at this time B3 =V B2 -V B1 ; Simultaneously calculate the internal pore volume V of the B group of separator samples B4 =V B0 -V B1 ; Compare V B3 and V B4 The actual acid absorption status of the partition samples in group B can be known at this time.

2. A test process and method for AGM separator for valve-regulated lead-acid battery according to claim 1, characterized in that: In step 5, V is calculated at the same time B1 '=V A0 / V B0 , compare V B1 ' and V B1 The relationship between the two is used to determine whether the compositions of the partition samples in group A and group B are the same.

3. The AGM separator testing process and method for valve-regulated lead-acid batteries according to claim 1, characterized in that: In the step 1, it also includes taking an AGM separator sample marked as C, and testing the structural strength of the A group separator samples after being soaked in water, the B group separator samples after being soaked in acid, and the C group separator samples.

4. The AGM separator testing process and method for valve-regulated lead-acid batteries according to claim 1, characterized in that: In the step 1, it also includes taking an AGM separator sample and marking it as D. Drain or dry the group A partition samples after soaking in water and the group B partition samples after soaking in acid; After drying, the partition samples of group A, group B and group D were placed at a height of 1m for free fall, and the lead paste falling amounts M1, M2 and M3 of the partition samples of group A, group B and group D were measured respectively.

5. A test process and method for AGM separator for valve-regulated lead-acid battery according to claim 4, characterized in that: Take the D group of partition samples, weigh them and mark them as m D1 ; The lead paste drop rates of the group A partition samples after immersion in water, the group B partition samples after acid immersion, and the group D partition samples are calculated as follows: T A =M1 / m A1 、T B =M2 / m B1 、T D =M3 / m D1 ; Compare T A、 T B和 T D Determine the effect of water immersion and acid immersion on the lead paste drop rate.

6. The AGM separator testing process and method for valve-regulated lead-acid batteries according to claim 1, characterized in that: The acid solution in the first acid tank contains methyl red solution.

7. A test process and method for AGM separator for valve-regulated lead-acid battery according to claim 6, characterized in that: The concentration of the methyl red solution is 1.28 g / cm 3 The mass fraction of methyl red solution in the acid solution is 1.5%.

8. The AGM separator testing process and method for valve-regulated lead-acid batteries according to claim 1, characterized in that: In step 6 and step 7, the temperature of the acid solution is controlled at 35-38°C; in step 1, the water temperature is controlled at 35-38°C.

9. The AGM separator testing process and method for valve-regulated lead-acid batteries according to claim 1, characterized in that: According to the acid absorption volume V B3 , acid density ρ2 and mass m of group B separator sample B2 The acid absorption of the B group separator sample is calculated as (ρ2×V B3 ) / m B2 .

Images